diff --git a/doc/mk_api_doc.py b/doc/mk_api_doc.py
index 6007b77c4..014a152b4 100644
--- a/doc/mk_api_doc.py
+++ b/doc/mk_api_doc.py
@@ -234,7 +234,7 @@ try:
if DOTNET_ENABLED:
website_dox_substitutions['DOTNET_API'] = (
'{prefix}'
- ''
+ ''
'.NET API').format(
prefix=bullet_point_prefix)
else: